• Title/Summary/Keyword: Fuel Cell

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A Study of Modeling PEM Fuel Cell System Using Multi-Variable Optimization Technique for Automotive Applications (다변수 최적화 기법을 이용한 자동차용 고분자전해질형 연료전지 시스템 모델링에 관한 연구)

  • Kim, Han-Sang;Min, Kyoung-Doug;Jeon, Soon-Il;Kim, Soo-Whan;Lim, Tae-Won;Park, Jin-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.11a
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    • pp.541-544
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    • 2005
  • This study presents the integrated modeling approach to simulate the proton exchange membrane (PEM) fuel cell system for vehicle application. The fuel cell system consisting of stack and balance of plant (BOP) was simulated with MATLAB/Simulink environment to estimate the maximum system power and investigate the effect of BOP component sizing on system performance and efficiency. The PEM fuel cell stack model was established by using a semi-empirical modeling. To maximize the net efficiency of fuel cel1 system, multi-variable optimization code was adopted. Using this method the optimized operating values were obtained according to various system net power levels. The fuel cell model established was co-linked to AVL CRUISE, a vehicle simulation package. Through the vehicle simulation software, the fuel economy of fuel cell powered electric vehicle for two types of driving cycles was presented and compared. It is expected that this study tan be effectively employed in the basic BOP component sizing and in establishing system operation map with respect to net power level of fuel cell system.

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Cell Design for Mixed Gas Fuel Cell (혼합가스 주입형 연료전지를 위한 전지 디자인)

  • Park, Byung-Tak;Yoon, Sung Pil
    • Journal of the Korean Ceramic Society
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    • v.42 no.12 s.283
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    • pp.860-864
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    • 2005
  • In this study, we fabricated honeycomb type Mixed-Gas Fuel Cell (MGFC) which has advantages of stacking to the axial direction and increasing volume power density. Honeycomb-shaped anode with four channels was prepared by dry pressing method. Two alternative channels were coated with electrolyte and cathode slurry in order to make cathodic reaction sites and the others were filled with partial oxidation (POX) catalyst to increase fuel conversion. Furthermore we employed the sol-gel technique which can increase cell performance and decrease carbon coking.

Modeling and Analysis of the Air Supply System for Vehicular PEM Fuel Cell (PEM 연료전지 자동차의 급기 시스템의 모델링 및 분석)

  • Jang, Hyuntak;Kang, Esak
    • Transactions of the Korean hydrogen and new energy society
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    • v.14 no.3
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    • pp.236-246
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    • 2003
  • This paper focuses on developing a model of a PEM fuel cell stack and to integrate it with realistic model of the air supply system for fuel cell vehicle application. The fuel cell system model is realistically and accurately simulated air supply operation and its effect on the system power and efficiency using simulation tool Matlab/Simulink. The Peak performance found at a pressure ratio of 3, and it give a 15mV increase per cell. The limit imposed is a minimum SR(Stoichiometric Ratio) of 2 at low fuel cell load and 2.5 at high fuel cell load.

Analysis of activation, ohmic, and concentration losses in hydrogen fuelled PEM fuel cell

  • Rohan Kumar;K.A Subramanian
    • Advances in Energy Research
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    • v.8 no.4
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    • pp.253-264
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    • 2022
  • This paper deals with the effects of design (active area, current density, membrane conductivity) and operating parameters (temperature, relative humidity) on the performance of hydrogen-fuelled proton exchange membrane (PEM) fuel cell. The design parameter of a PEM fuel cell with the active area of the single cell considered in this study is 25 cm2 (5 × 5). The operating voltage and current density of the fuel cell were 0.7 V and 0.5 A/cm2 respectively. The variations of activation voltage, ohmic voltage, and concentration voltage with respect to current density are analyzed in detail. The membrane conductivity with variable relative humidity is also analyzed. The results show that the maximum activation overpotential of the fuel cell was 0.4358 V at 0.21 A/cm2 due to slow reaction kinetics. The calculated ohmic and concentrated overpotential in the fuel cell was 0.01395 V at 0.76 A/cm2 and 0.027 V at 1.46 A/cm2 respectively.

Research Trend and Analysis of Altitude and Endurance for Fuel Cell Unmanned Aerial Vehicles (연료전지 무인항공기의 고도와 체공시간에 대한 특성 분석 및 최신 연구동향)

  • Cho, Seonghyun;Kim, Minjin;Son, Youngjun;Yang, Taehyun
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.4
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    • pp.393-404
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    • 2014
  • Unmanned aerial vehicles (UAVs) have been applied to not only military missions like surveillance and reconnaissance but also commercial missions like meteorological observation, aerial photograph, communication relay, internet network build and disaster observation. Fuel cells make UAVs eco-friendly by using hydrogen. Proton exchange membrane fuel cells (PEMFCs) show low operation temperature, high efficiency, low noise and high energy density and those characterisitcs are well fitted with UAVs. Thus Fuel cell based UAVs have been actively developed in the world. Recently, fuel cell UAVs have started to develope for high altitude UAVs because target altitude of UAVs is expanded upto stratosphere altitude. Long endurance of UAVs is essential to improve effects of the missions. Improvement of UAV endurance time could be fulfilled by developing a hydrogen fuel storage system with high energy density and reducing the weight of UAVs. In this paper, research trend and analysis of fuel cell UAVs are introduced in terms of their altitude and endurance time and then the prospect of fuel cell UAVs are shown.

An Assessment on Harmonics Effect in Customer and the Distributed Power System during Grid Connection of Residential Fuel Cell System (가정용 연료전지 시스템의 계통연계 시 수용가 및 배전계통에서의 고조파 영향 평가)

  • Park, Chan-Eom;Jung, Jin-Soo;Han, Woon-Ki
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.6
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    • pp.1280-1285
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    • 2011
  • Recently, due to the use of fossil fuels for electric power production, carbon emissions increased excessively. Thereby, in order to replace fossil fuels, many studies about fossil fuels such as solar and fuel cell energy source are progressing. Fuel cell system has high energy conversion efficiency. Also, fuel cell system is environmentally friendly system because the carbon emission is almost not occur. Therefore, the fuel cell system is considered as the core technology of in the fields of the future energy and environmental. Fuel cell system has an effect on distribution power system because another power source of other than large power plants. So, fuel cell system can be degradation reason of power quality in the power system. In this paper, we constructed the system for an assessment on harmonics effect. The system is composed with power source, harmonics generation and linear load, fuel cell system. we also performed assessment on harmonics effect in customer and the distributed power system during grid connection of residential fuel cell system. An assessment cases are divided into three. A Case 1 is state that residential load and fuel system are connected to grid, Case 2 is state that residential load and harmonics load are connected to grid, and Case 3 is state that all loads are connected to grid. As a output of fuel cell system is increase, analysis results based on assessment system showed that power quality became more aggravation as effect of harmonics.

Measurements and Numerical Analysis of Electric Cart and Fuel Cell to Estimate Operating Characteristic of FCEV (연료전지 자동차의 주행성능 예측을 위한 전기자동차 및 연료전지의 성능실험과 수학적 모델링)

  • Cho, Yong-Seok;Kim, Duk-Sang;An, Seok-Jong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.5
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    • pp.65-72
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    • 2006
  • In new generation vehicle technologies, a fuel cell vehicle becomes more important, by virtue of their emission merits. In addition, a fuel cell is considered as a major source to generate the electricity for vehicles in near future. This paper focuses on modeling of not only an electric vehicle and but also a fuel cell vehicle to estimate performances. And an EV cart is manufactured to verify the modeling. Speed, voltage, and current of the vehicle and modeling are compared to estimate them at acceleration test and driving mode test. The estimations are also compared with the data of the Ballard Nexa fuel cell stack. In order to investigate a fuel cell based vehicle, motor and fuel cell models are integrated in a electric vehicle model. The characteristics of individual components are also integrated. Calculated fuel cell equations show good agreements with test results. In the fuel cell vehicle simulation, maximum speed and hydrogen fuel consumption are estimated. Even though there is no experimental data from vehicle tests, the vehicle simulation showed physically-acceptable vehicle characteristics.

A Study on the Economic Evaluation with Super-Micro Fuel Cell Home Cogeneration System by Varying the Floor Area of House (주택면적의 변화에 따른 가정용 초소형 연료전지 코제너레이션 시스템의 경제성 분석에 관한 연구)

  • Roh, Chul-Woo;Kim, Min-Soo
    • New & Renewable Energy
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    • v.4 no.2
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    • pp.45-51
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    • 2008
  • The fuel cell system is environment-friendly and energy efficient system. Especially, the fuel cell cogeneration systems providing heat and electricity to buildings have been developed and applied to a lot of sites in the world to cope with the global warming and $CO_2$ emission problem. This paper presents the result of study on the economic evaluation with super-micro fuel cell (SMFC) cogeneration system by varying the floor area ($132m^2{\sim}331m^2$) of the house, whose system capacity ranges from 0.10 kWe to 0.50 kWe. The electricity demand, heat demand, saved energy cost, and the simple pay-back period have been simulated for the various capacities of fuel cell cogeneration system. As a result, this study suggests the fuel cell system’s capacity decision strategy for a given house area. Contrary to conventional design assumptions, the smaller capacity fuel cell cogeneration system is appropriate for the house of large floor area to defense the progressive electricity tax, and the larger capacity fuel cell cogeneration system is appropriate for the house of small floor area to sell the electricity.

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A Study on PWM Converter/Inverter Drive System by a Fuel Cell Simulator (연료전지 Simulator에 의한 PWM 컨버터/인버터 구동시스템에 관한 연구)

  • 이태원;장수진;김진태;구자성;원충연;김창현
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.3
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    • pp.222-230
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    • 2004
  • In this paper, a 3㎾ fuel cell generation system with an active fuel cell simulator has been proposed. The developed fuel cell simulator generates the actual voltage and current output characteristics of the Polymer Electrolyte Membrane Fuel Cell (PEMFC), so that the overall performance and the dynamics of the proposed system could be effectively examined and tested. In This paper, at first, the system configuration and operational principle of the developed fuel cell simulator has been investigated and the design process of the fuel cell generation system is explained in detail. In addition, the validity of the proposed system has been verified lly the informative simulation and experimental result

A Study on the Economic Evaluation with Super-Micro Fuel Cell Home Cogeneration System by Varying the Floor Area of House (주택면적의 변화에 따른 가정용 초소형 연료전지 코제너레이션 시스템의 경제성 분석에 관한 연구)

  • Roh, Chul-Woo;Kim, Min-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.25-28
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    • 2008
  • The fuel cell system is environment-friendly and energy efficient system. Especially, the fuel cell cogeneration systems providing heat and electricity to buildings have been developed and applied to a lot of sites in the world to cope with the global warming and $CO_2$ emission problem. This paper presents the result of study on the economic evaluation with super-micro fuel cell (SMFC) cogeneration system by varying the floor area ($132m^2{\sim}331m^2$) of the house, whose system capacity ranges from 0.10 kWe to 0.50 kWe. The electricity demand, heat demand, saved energy cost, and the simple pay-back period have been simulated for the various capacities of fuel cell cogeneration system. As a result, this study suggests the fuel cell system's capacity decision strategy for a given house area. Contrary to conventional design assumptions, the smaller capacity fuel cell cogeneration system is appropriate for the house of large floor area to defense the progressive electricity tax, and the larger capacity fuel cell cogeneration system is appropriate for the house of small floor area to sell the electricity.

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